Building today imposes sustainability, or “attention” to renewable energy and to all those aspects and elements involved not only in the construction of the building but also in the production of the same parts, the maintenance and the eventual disposal. The timber building is built, of course, natural materials and biologically degradable. The life cycle of the timber presents a budget neutral CO2 and at the same time is the building material whose processing and transformation generates less production of carbon dioxide, if used as a building material, stored in the building maintains a substantial amount of CO2 that it is then released into the atmosphere (until it is destroyed, burned or damaged by biological agents). The production of wood requires only the use of solar energy for growing plants addition to that used for machining (cutting, grinding, etc.) Of the material and to transport in the pipeline. The energy balance of wood appears to be therefore particularly interesting in that it reduces the total energy consumption of the building, from construction to maintenance, making it a cutting-edge system with respect to environmental sustainability.